mrsrobinson
Well-Known Member
My new to me 2001 Sea Ray 380DA with Caterpillars 3126s ran at 180 degrees on plane for her first 12 hours of use. I put her in mud (at idle speed) coming into the new to me slip she is now in. Both engines overheated. Both sea strainers were packed, and I mean packed, full of black crude looking thick mud. I cleaned them up, let the engines cool down, fired both up, brown mud shot out of the exhaust, and they have both been running under 180 degrees at the dock/slip. Good water flow at the exhausts, both the underwater and sides.
We tried to replace the aftercooler zincs this Saturday while we were doing some other service. I tried one on each, the zinc broke off inside the after cooler, or was already broken off, so I stopped.
After completing the service, I put her up on plane then/Saturday for the first time since the mud. Both engines slowly, very slowly, creeped up to 200 degrees and then slightly over. When I dropped her down to idle, they quickly went back to 180 degrees and stayed there.
If my memory is correct, I had a bad raw water impeller in my 330DA and it ran hotter at idle, cooler on plane.
Mechanic thinks something is clogging up the raw water system. Whatever it is it's happening to both engines. Sound like the raw water impellers? Aftercoolers? Other?
Thanks
We tried to replace the aftercooler zincs this Saturday while we were doing some other service. I tried one on each, the zinc broke off inside the after cooler, or was already broken off, so I stopped.
After completing the service, I put her up on plane then/Saturday for the first time since the mud. Both engines slowly, very slowly, creeped up to 200 degrees and then slightly over. When I dropped her down to idle, they quickly went back to 180 degrees and stayed there.
If my memory is correct, I had a bad raw water impeller in my 330DA and it ran hotter at idle, cooler on plane.
Mechanic thinks something is clogging up the raw water system. Whatever it is it's happening to both engines. Sound like the raw water impellers? Aftercoolers? Other?
Thanks